AP Ezreal is a good counter to plenty of people. The reason for this guide is not a lot people play AP Ezreal and when someone does there is a dodge or "AP Ez sucks we lose GG" before even getting into the game. My Main is AP Ezreal for the most part and whenever I play him I usually dominate the other mid.

Pros
1. Has a VERY poke
2. Ult hits over 1600 late game
3. The flash and arcane shift are great for escape
4. Mystic shot applies sheen which also means lich bane which hits over 750 late game

Cons
1. If you are bad at skill shots get better or this guide will not help you
2. Unless you have a premade team you are not going to get told were people are and to ult them with your ult
3.

1. I HIGHLY recommend Flash Ignite for extra jukes and ignite because well your mid.
2. If u want u can take CV instead of ignite for ult snipes which is fun.

1. Start off with boots and 3 health pots (later build boots into cdr or magic pen depending on what they are building)
2. Try on your first back to instant buy sheen which will give you more damage on Q for better poke
3. Second back if u can buy needless large rod but if not buy a blasting wand and a Null-Magic Mantle
4. On Your third back you want to try as hard as possible to finish death cap
5. Fifth back I recommend finishing off the mantle with a lich bane
6. Depending if you are fed you will want to go for hourglass but if not get a void staff
7. You NEED hourglass now if you don't have it because you are way to squishy but if you have one just buy void staff
8. Your are going to want to get Evil Tomb for the cool down
9. Depending if u want tanky get a crystal scepter but if u don't want that just get a WOTA
10. Now you are going to want to buy WOTA if u bought scepter or vis-versa